Why can't add the corner normally?

It’s always adding in the wrong direction. Is there any step i did wrong?
viedo here

maybe the points in the base glyph are not exactly aligned?
– Align selection
– Pug in: Angled Handles could be useful

but i think you can fix this manually with this arrows in the grey info box
explained here at Corner Components on Diagonal Stems Tutorial

I have tried this but it’s still wrong.

I think the issue is: the initial point from the corner must be aligned with the origin, that would be x = 0

It works! Thanks for answering!